Display device capable of detecting whether a power cable is abnormally connected

1. A display device, comprising: a display panel comprising a plurality of pixels; a first source board and a second source board connected to the display panel; and a control board connected to the first source board via a first power cable and connected to the second source board via a second power cable, wherein the control board is configured to control a power voltage provided to the pixels based on a first connection signal received from a first ground line of the first power cable and a second connection signal received from a second ground line of the second power cable, wherein the first connection signal is equal to a ground voltage received through the first ground line when the first power cable is normally connected between the control board and the first source board, wherein the control board comprises a detecting signal generator configured to receive the first connection signal from the first ground line and the second connection signal from the second round line, and generate a detecting signal based on the first connection signal and the second connection signal, wherein the detecting signal generator comprises: a first switching element comprising a base connected to a first node that receives the first connection signal, an emitter that receives a reference voltage, and a collector connected to a second node to which a first detecting signal is output as the detecting signal; and a second switching element comprising a base connected to a third node that receives the second connection signal, an emitter that receives the reference voltage, and a collector connected to a fourth node to which a second detecting signal is output as the detecting signal.

2. The display device of claim 1 , wherein the first ground line receives the ground voltage via the first source board and the second ground line receives the ground voltage via the second source board.

3. The display device of claim 1 , wherein the control board further comprises: an enable signal generator configured to generate a first enable signal based on the detecting signal; and a power voltage controller configured to control the power voltage based on the first enable signal.

4. The display device of claim 3 , wherein the enable signal generator comprises: an AND gate circuit configured to generate the first enable signal by performing a logical AND operation on the first detecting signal, the second detecting signal, and a second enable signal.

5. The display device of claim 3 , wherein the power voltage controller comprises: a switching controller configured to generate a selection signal based on the first enable signal; a DC-DC converter configured to generate a plurality of converted voltages based on an input voltage; and a power voltage selector configured to output the power voltage by selecting at least one of the converted voltages based on the selection signal.

6. The display device of claim 5 , wherein the switching controller generates the selection signal such that the power voltage is not output when the first enable signal is deactivated.

7. The display device of claim 5 , wherein the power voltage selector comprises: a first selector circuit configured to select a first power voltage applied to an anode electrode of an organic light emitting diode (OLED) included in each of the pixels from among the converted voltages based on the selection signal; and a second selector circuit configured to select a second power voltage applied to a cathode electrode of the OLED from among the converted voltages based on the selection signal.

8. The display device of claim 7 , wherein the switching controller generates the selection signal such that the second power voltage is greater than the first power voltage when the first enable signal is deactivated.

9. The display device of claim 7 , wherein the pixels are driven using simultaneous emission driving, and a single frame is divided into an emission period and a non-emission period, and wherein the switching controller generates the selection signal such that the first power voltage is greater than the second power voltage during the emission period, and the second power voltage is greater than the first power voltage during the non-emission period when the first enable signal is activated.

10. The display device of claim 1 , wherein the detecting signal generator further comprises: a first pull-up resistor connected between the first node and the reference voltage; a second pull-up resistor connected between the third node and the reference voltage; a first pull-down resistor connected between the second node and a ground terminal; and a second pull-down resistor connected between the fourth node and the ground terminal.

11. The display device of claim 1 , wherein the control board comprises: a processor configured to receive the first connection signal from the first ground line and the second connection signal from the second ground line, and generate a first enable signal based on the first connection signal and the second connection signal; and a power voltage controller configured to control the power voltage based on the first enable signal.

12. A display device, comprising: a display panel comprising a plurality of pixels; a first source board and a second source board connected to the display panel; and a control board connected to the first source board via a first power cable and connected to the second source board via a second power cable, wherein the control board is configured to control a power voltage, provided to the pixels based on a first connection signal received from a first ground line of the first power cable and a second connection signal received from a second ground line of the second power cable, wherein the first connection signal is equal to a ground voltage received through the first ground line when the first power cable is normally connected between the control board and the first source board, wherein the control board comprises: a detecting signal generator configured to receive the first connection signal from the first ground line and the second connection signal from the second ground line, and generate a detecting signal based on the first connection signal and the second connection signal, wherein the detecting signal generator comprises: an OR gate circuit comprising a first input terminal connected to a first node that receives the first connection signal, a second input terminal connected to a second node that receives the second connection signal, and an output terminal; a switching element comprising a base connected to a third node that is connected to the output terminal of the OR gate circuit, an emitter that receives a reference voltage, and a collector connected to a fourth node to which the detecting signal is output; a first pull-up resistor connected between the first node and the reference voltage; a second pull-up resistor connected between the second node and the reference voltage; a third pull-up resistor connected between the third node and the reference voltage; and a pull-down resistor connected between the fourth node and a ground terminal.

13. The display device of claim 12 , wherein the control board further comprises: an enable signal generator configured to generate a first enable signal based on the detecting signal; and a power voltage controller configured to control the power voltage based on the first enable signal.

14. The display device of claim 13 , wherein the enable signal generator comprises: an AND gate circuit configured to generate the first enable signal by performing a logical AND operation on the detecting signal and a second enable signal.

15. A display device, comprising: a display panel comprising a plurality of pixels; and a power management circuit configured to provide a power voltage to the pixels via first through (N)th power cables, wherein the first through (N)th power cables respectively comprise first through (N)th ground lines, and the power management circuit is configured to control the power voltage based on first through (N)th connection signals respectively received from the first through (N)th ground lines, wherein N is an integer greater than 1, wherein each of the first through (N)th connection signals is equal to a ground voltage received through the first through (N)th ground lines when the first through (N)th power cables are normally connected between the power management circuit and the display panel, wherein the power management circuit controls the power voltage to operate the pixels when each of the first through (N)th connection signals is equal to the ground voltage, and the power management circuit controls the power voltage such that the pixels are not operated when each of the first through (N)th connection signals is not equal to the ground voltage, wherein the first through (N)th connection signals are respectively received through only one pin of each of the first through (N)th power cables, and the power management circuit detects whether each of the first through (N)th power cables is abnormally connected between the power management circuit and the display panel using the only one pin of each of the first through (N)th power cables.

16. The display device of claim 15 , wherein the power management circuit comprises: a detecting signal generator configured to generate a detecting signal based on the first through (N)th connection signals; an enable signal generator configured to generate a first enable signal based on the detecting signal; and a power voltage controller configured to control the power voltage based on the first enable signal.

17. The display device of claim 16 , wherein the detecting signal generator comprises first through (N)th switching elements, and wherein a (K)th switching element comprises a base that receives a (K)th connection signal, an emitter that receives a reference voltage, and a collector to which a (K)th detecting signal is output as the detecting signal, wherein K is an integer between 1 and N.

18. The display device of claim 16 , wherein the enable signal generator comprises: an AND gate circuit configured to generate the first enable signal by performing a logical AND operation on first through (N)th detecting signals and a second enable signal.

19. The display device of claim 16 , wherein the detecting signal generator comprises: an OR gate circuit configured to generate an output signal by performing a logical OR operation on the first through (N)th connection signals; and a detecting signal switching element comprising a base that receives the output signal of the OR gate circuit, an emitter that receives a reference voltage, and a collector to which the detecting signal is output.

20. The display device of claim 19 , wherein the enable signal generator comprises: an AND gate circuit configured to generate the first enable signal by performing a logical AND operation on the detecting signal and a second enable signal.

21. A display device, comprising: a display panel comprising a plurality of pixels; a first source board and a second source board connected to the display panel; and a control board connected to the first source board via a first power cable comprising a first detecting line and a second detecting line, and connected to the second source board via a second power cable comprising a third detecting line and a fourth detecting line, wherein a first terminal of the second detecting line is connected to a first terminal of the first detecting line via the first source board, wherein a first terminal of the third detecting line is connected to a second terminal of the second detecting line via the control board, wherein a first terminal of the fourth detecting line is connected to a second terminal of the third detecting line via the second source board, and wherein the control board comprises: a processor configured to provide a detecting signal to a second terminal of the first detecting line; an enable signal generator configured to receive a feedback signal from a second terminal of the fourth detecting line and to generate a first enable signal based on the feedback signal; and a power voltage controller configured to control a power voltage based on the first enable signal.